EomPreferencesDialog: Convert to GtkBuilder template

Also embed the plugin manager into the template directly.

origin commit:
https://gitlab.gnome.org/GNOME/eog/commit/f96947c

Author: fxri

data/Makefile.am

@@ -22,7 +22,6 @@ gsettings_SCHEMAS = org.mate.eom.gschema.xml
 
 uidir = $(pkgdatadir)
 ui_DATA = \
-	eom-preferences-dialog.ui \
 	eom-toolbar.xml
 
 pkgconfigdir = $(libdir)/pkgconfig
@@ -33,6 +32,7 @@ EXTRA_DIST = \
 	eom.css			\
 	eom-image-properties-dialog.ui	\
 	eom-multiple-save-as-dialog.ui	\
+	eom-preferences-dialog.ui \
 	eom-ui.xml		\
 	metadata-sidebar.ui	\
 	$(DESKTOP_IN_FILES) \

data/eom-preferences-dialog.ui

@@ -2,27 +2,26 @@
 <!-- Generated with glade 3.20.0 -->
 <interface>
   <requires lib="gtk+" version="3.14"/>
+  <requires lib="libpeas-gtk" version="1.0"/>
   <object class="GtkAdjustment" id="adjustment1">
     <property name="lower">1</property>
     <property name="upper">100</property>
     <property name="value">5</property>
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>
-  <object class="GtkDialog" id="eom_preferences_dialog">
+  <template class="EomPreferencesDialog" parent="GtkDialog">
     <property name="can_focus">False</property>
     <property name="border_width">5</property>
     <property name="title" translatable="yes">Eye of MATE Preferences</property>
     <property name="type_hint">dialog</property>
     <child internal-child="vbox">
       <object class="GtkBox" id="dialog-vbox1">
-        <property name="visible">True</property>
         <property name="can_focus">False</property>
         <property name="orientation">vertical</property>
         <property name="spacing">2</property>
         <child internal-child="action_area">
           <object class="GtkButtonBox" id="dialog-action_area1">
-            <property name="visible">True</property>
             <property name="can_focus">False</property>
             <property name="layout_style">end</property>
             <child>
@@ -369,7 +368,7 @@
                                   </packing>
                                 </child>
                                 <child>
-                                  <object class="GtkColorButton" id="color_button">
+                                  <object class="GtkColorButton" id="transp_color_button">
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
                                     <property name="receives_default">False</property>
@@ -700,7 +699,16 @@
                 <property name="border_width">12</property>
                 <property name="orientation">vertical</property>
                 <child>
-                  <placeholder/>
+                  <object class="PeasGtkPluginManager" id="plugin_manager">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="orientation">vertical</property>
+                  </object>
+                  <packing>
+                    <property name="expand">True</property>
+                    <property name="fill">True</property>
+                    <property name="position">0</property>
+                  </packing>
                 </child>
               </object>
               <packing>
@@ -734,5 +742,5 @@
     <style>
       <class name="eom-preferences-dialog"/>
     </style>
-  </object>
+  </template>
 </interface>